Well I can't help you with the slowing down problem, but the reason you get porno search results is becouse some of the porno files have a extra long filename .
In this extention of the filename you will find the filename you are looking for.

e.g.
Porno_file_ebookmp3shaggyanalolitapreteenudedvdido jpgamexeminematrixcumpegayavisexxxdivxasianraras** **warezipornocock.jpg

So if you are looking for something like ebook, dvd, game, divX or warez, you would get this Porno .jpg file included in your search results.


**** these 4 stars in the filename would be letters in real life